GeForce GTX590 at PAX East; Asus, EVGA Only?

Not to be outdone by AMD's Radeon HD 6990, Nvidia is supposedly going to unleash some dual-GPU goodness of its own at PAX East in Boston on March 11 to 13.

Interestingly enough, sources close to Nvidia tell us that only ASUS and EVGA will be offering the GeForce GTX 590 in the North American market. It's unclear why this will be the case, but hopefully we will get some kind of official response when the card goes public.